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arXiv 1004.5044math.PR
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一维Killing扩散方程的拟极限行为

Quasilimiting behavior for one-dimensional diffusions with killing

Martin Kolb, David Steinsaltz

摘要:

本文将Steinsaltz和Evans [Trans.Amer.Math.Soc.359(2007)1285-1234]的结果扩展和澄清,该结果发现了以生存为条件的杀死一维扩散收敛的条件,其密度由生成元的主特征函数给出的准平稳分布。假设在无穷远处的杀戮极限不同于主特征值,我们证明了收敛到拟平稳性的发生当且仅当主特征函数是可积的。当无穷远处的killing大于主本征值时,则本征函数总是可积的。当在无穷远处的杀戮较小时,特征函数仅当未杀戮过程是常返的时是可积的;否则,以生存为条件的过程在任何有界区间上收敛于0密度。

英文摘要:

This paper extends and clarifies results of Steinsaltz and Evans [Trans. Amer. Math. Soc. 359 (2007) 1285-1234], which found conditions for convergence of a killed one-dimensional diffusion conditioned on survival, to a quasistationary distribution whose density is given by the principal eigenfunction of the generator. Under the assumption that the limit of the killing at infinity differs from the principal eigenvalue we prove that convergence to quasistationarity occurs if and only if the principal eigenfunction is integrable. When the killing at infinity is larger than the principal eigenvalue, then the eigenfunction is always integrable. When the killing at infinity is smaller, the eigenfunction is integrable only when the unkilled process is recurrent; otherwise, the process conditioned on survival converges to 0 density on any bounded interval.

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